Method of protecting the surfaces of metal molds



May 5, 1925. a 1,536,952 v s. M. UDALE ET AL I METHOD OF PROTECTING THE SURFACES OF METAL HOLDS Filed May 6, 1922 q. 7 z ............n 0 h Mum- J1...

I INVENTORJ Patented May 5, 1925.

UNITED STATES STANLEY M. UDALE Ann DANIEL H. MELOCHE, or nnrnorr, MICHIGAN, assrenoas 'ro PATENT oFFlcE.

GEORGE M. HOLLEY, OF DETROIT, MICHIGAN.

METHOD OF PROTECTING THE SURFACES OF METAL HOLDS.

Application filed May 6,

To all whom it may concern: Be it known that we, STANLEY M. UDALE,

. and DANIEL H. MELOOHE, citizens of the United States, residing at 893 Lothrop 1 Ave, and 8450 Fourteenth St, Detroit, in

the. county of lVayne and State of Michigan, have invented certain new and useful Improvements in Methods of Protecting the Surfaces of Metal Molds, of which the following is a specification.

This. invention relates to improved means for the protection of surfaces offmetal molds used in the continuous. production of metal castings. This invention consists essentially in the application to a permanent mold of a refractory coating applied by means of a blow torch.

The molds are "preferably made of-cast iron and the chief object of this invention is to provide means for the protection'of the surfaces of such molds when used for the'production of grey iron castings.

The actual method practiced by the appl'icant is shown in the figure, in which a a an intensely hotflame results.

- protected by a refractory lining G.

- pipe A is connected to aregulable supply of oxygen and acetylene. -The pipe A is threaded into the casing'B, which is-preferahly lined with a refractory coating- Air;

entrances C-and D-may be. provided as required. A depression E is located in the casing B forming a-crater. Opposite this crater E is the opening F, through which the refractory powder is fed into the cratc'r E. The casing B and crater -E are The amount of oxygen and the area of the air openings C and D are regulated so that H represents a pcrmanentmaster positive mold which is to he protected by means of a refractory coating. I v

The flame is directed against-the mold H and as the refractory powder is highly heated as it travels toward the mold through the flame it therefore arrives at the mold in a highly heated state and as the mold is also heated by the flame directed upon it, the refractory substance adheres to the mold. The refractory particles, which are very finely divided, are at a white heat -when they"strike thev heated mold, which accounts for the fact that they do adhere firmly enough so as to protect the molds 1922. Serial No. 558,076.

during repeated use. Moreover, the iron is softened slightly by the heat, whereas the hardness of the refractory particles is notare cast, having a casting temperature in 'excessof 2000 F., which consists in subjecting the surface of the mold to the action 'of a blow torch, to the flame of which a refractory powder is fed.

2. The method of protecting the metal surface of permanent metal molds to be used in the'production of metal castings which consists in coating the surface of metal molds with a refractory non-volatile metallic oxide, the metallic oxide being ap-. plied in powdered form within the flame of a blow torch directed against the surface of the permanent iron mold.

of permanent metal molds in which metals 3..The method of protecting the metal surface of permanent iron molds which consists in heating the surface of the mold by a. blow torch directed against the surface and injecting into said flame a refractory powder. i

4. The method of protecting the metal surface of permanent iron molds, which consists in heating the surface of the iron molds by means of the flame of a blow torch directed against the surfaceof the said molds and 'injectingihto the flame powdered stannic oxide whereby the particles of stannic oxide are carried inst the surface of theiron molds which are thereby coated withthe stannic oxide.

- In testimonywhereof we afiix our signs.

STANLEY l DANIEL H. MELOCHE.

tures. 

